Grinder



G. H. IVICFEATERS.

GRINDER..

APPLICATION FILED IAILSI, I922.

1942,57 l 231 n Patented Aug. 8, 1922.

l ings,

rality of spaced castors or entre@ stares PATENT 4CFJHC..

GEQRGE El. MCJFEAT, @F JOHNSTQWN, PENNSYLVANEA @RENDRE linearer.

Specication of Letters Patent.

Patented Aug.. 8, 1922.

Application tiled January 3l, 1922. Serial No, 532,999.

has for one of its objects the provision of a grinder of this class thatmay be quickly transported from place to lace. j

Another object is to provide a grinder of this class that will have thegrinding mechanism so mounted that it may be swung around a considerableradius, thereby permitting it to be used at did'erent points withoutmoving the base.

A further object'isto provide a grinder of the class described havingthe novel construction and combination of parts described in thefollowing specification and illustrated in the accompanying drawings, inwhich- Figure 1 is a perspective view of a grinder constructed inaccordance with my invention. f

Figure 2 is a fragmentary detail showing the manner in which the sleevebearing carrying the motor shaft is mounted. Figu llllll of Figure 2.

Figure d is a fragmentary elevation partly in section, show ing themanner in which the supporting beam is pivotally mounted on the uprightor standard of the device..

Referring more particularly to the drawthe numeral 2 designates thecircular disk base member which has a pluwheels 3 secured is secured tothe plate or thereon. A pin or leg a base between each of the rollersand terdll minates short of the floor line. The pins or legs l areadapted to form additional supports for the base so that if for anyreason the base is tilted the legs d will engage the door and preventfurther tilting.

A tubular standard 5 is secured to, and

projects upwardly from, the center of the disk or base 2 and is adaptedto supporta tubular beam member 6. 'lhe member is of tubular form and isprovided at a point intermediate its ends with a shaft 7 lwhich rojectsdownwardly within the standar 5. The shaft 7 is journaled in thestandard 5 and is provided at its upper and lower ends re 3 is asectional view on the line p with suitable anti-friction bearings 8 and9. i

A suitable spacing sleeve 10 is arranged around the shaft 7 and servesto hold the bearings 8 and 9 inspaced relation. The lower end of theshaft 7 is provided with a screw thread and a nut 1l is threaded thereonto tie the bearings 8 and 9, sleeve 10, and shaft 7 together. rlhe lowerbearing 8 is of .less diameter than the 'insidel diameter of thestandard 5 and is held in adjustable spaced relation with the innerperiphery of the standard by a plurality of set screws 12 which arethreaded through the standard 5 and engage against the bearing 8 and areadaptedto be so adjusted as to maintain the beam at right angles to thevertical axis of the standard 5. y

rlhe forward or supporting end of the beam member 6 is. provided withspaced stops la and 15, and a trolley member 16 is mounted on the beambetween the stops. A

suspension chain i7 is vsecured to the ytrolley 16 and is' providedadjacent its lower end with a turn-buckle 18 for adjusting its length.The turn-buckle 18 is provided with a hand wheel 19 for operating it anda latch member 20 is adapted to engage in suitable notches 21 in thehandwheel 19 to lock it in adjusted position.

rlhe lower end of the suspension chain is rovided with a collar member22 which is adjustably secured on a supporting rod 23 which is adaptedto support the grinding mechanism. A motor 24e is suspended from the rod23 by means of a clamping member 25 which engages the rod 23 and issecured to the motor housing. A sleeve 26 projects outwardly from themotor housing parallel with the rod 23 and is suspended therefrom bysuspending brackets 27 land 28. rlihe armature shaft 2d through thesleeve 26 and has a grinding wheel 29 secured on its free end.

A safety guard or hood 30 is welded or otherwise secured to the free endof the sleeve .26 and has a lug 31y projecting upwardly therefrom whichis secured to the end of the rod 23 by a screw 32.

'lhe collar member 22 is adapted to be adjusted along the rod .23 so asto maintain the grinding mechanism in a horizontal balanced position,the balance of which will vary with the various grinding wheels.

The'bracket 28, sleeve 26, and shaft 2te are provided with apertures 39,39 and 39, respectively, which are adapted to be alined cey of the motor2d projects ldd Jill@ with each other, and a locking pin insertedtherethrough when it is desired to change the grinding Wheels. Thelocking pin when inserted being adapted to prevent the turninof theshaft 24a.

he rear end of the beam 6 is provided with counterweight 33 adapted tocounterbalance the grinding mechanism.

A tubular column 34 projects downwardly from the rear portion of thebeam 6 and is in communication with the interior thereof. A make andbrake device such as the starting box 35 shown, is secured to the lowerend of the column 34, and the electric current for operating the motor24: is provided b a cable 36 which leads into the box 35. 'lllie currentis 'conducted from the box throu h a cable 37 which passes through thetu ular column 34 and beam 6 to a suitable outlet, and then passes tothemotor.

A handle member 38 is pivotally secured to the standard 5 to facilitatethe handling of the apparatus when transporting it.

It will be readily seen that a grinder constructed as abovedescribed-may be swung around a circle having a comparatively largeradius, and thus serve a considerable area, it may be bodily movedaround a plant, it may be adjusted horizontally and vertically so as tobe readily adapted to various work, and it is so balanced as to beeasilyv operated.

l claim:

1. A portable grinder comprising in combination, a Wheeled base, avertical standard projecting upwardly from said base` a horizontalsupporting beam pivotally mounted intermediate its ends on saldstandard, a trolley member mounted for horizontal movement on said beam,a flexible supporting element suspended from said trolley, a collarmember secured on the lower end of said element and adjustably securedto a horizontally disposed supporting rod, a

motor suspended from adjacent one end of said rod, a bearing sleeveprojecting 'from said motor and suspended from, said rod, a motor drivenshaft within said sleeve, a grinding wheel on the free end of saidshaft, means for supplying electric power to said motor, and means forcounterbalancing said motor, grinding wheel and associated parts.

2. A. portable grinder comprising in combination, a wheeled base, avertical standard projecting upwardly from said base, a horizontalsupporting beam pivotally mounted intermediate its ends on saidstandard, :i trolley member mounted for horizontal movement on saidbeam, a flexible supporting element suspended from said trolley andsecured to a horizontally disposed supporting rod, means for adjustingsaid element vertically, a motor suspended .from adjacent one end ofsaid rod, a bearing sleeve projecting from said motor and suspended fromsaid rod, a motor driven shaft journaled within said bearing sleeve, anda grinding wheel carried by said shaft.

3. A portable grinder comprising a circular disk-like base member,wheels arranged at spaced intervals around said base` rigid pinsprojecting downwardly from said base and terminating short of' the floorline and adapted to engage the floor only if the base is tilted, a rigidvertical standard projecting upwardly from said base, ahorizontalsupporting beam pivotally mounted,

intermediate its ends on said standard, a power driven grindingmechanism carried b v a flexible supporting member suspended from saidbeam and movable horizontally relative thereto, and means for adjustingsaid flexible supporting element vertically'y relative to said beam.

ln testimony whereof l have hereunto set

